i write a new online tool for website which can compress/encode your php source code and also make it undetectable by antiviruses if it has something malicious .
tool address : http://fereidani.ir/tools/php_encoder
i should mention i design this program just for research purposes and any illegal use of this tool is at your own risk ,

so so , for test , i used a simple r57shell script ( yeah i am old fashioned :D ) ,